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  • Clyde Boyer thinks this is interesting:

A trigger is whatever initiates a microinteraction. Manual triggers are user initiated, and can be a control, an icon, a form, or a voice, touch, or gestural command. System-initiated triggers happen when a certain set of conditions are met.

From

Cover of Microinteractions: Full Color Edition

Note

The time of day can have an impact on the kinds of triggers for the app. Example: Noon triggers lunchtime transitions.